There are 6804 such numbers.
18
There are 22680 numbers, excluding those with leading 0s.
1
If you include the number 3,000, there are exactly 2,001 4-digit numbers between 500 and 3000.
27: 077,177,277,377,477,577,677,877,977,717,727,737,747,757,767,777,787,797
18
There are 22680 numbers, excluding those with leading 0s.
17
There are 9000 4-digit numbers. 8*9*9*9 = 5832 of them do not contain a 5 The remaining 3168 contain a 5.
1
-2
-5
-5
It would help to know which digit. 0 appears in 9 numbers and each of the others in 18 numbers.
252
The pages of a book are numbered from 1 to 128. How many page numbers contain the digit 6?
648